======================== unified (from filesystem) ========================
                                         'bitrate'  '238.671'
                                        'duration'  '369'
                                          'artist'  'Recoil'
                                     'text_people'  ''
                                         'release'  'Liquid'
                                           'title'  'Want'
                                           'quals'  "['q-bass-4', 'q-drums-3', 'q-other-2', 'q-piano-1', 'q-vocals-2']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  '2'
                                      'tracktotal'  '11'
                                            'date'  ''
                                        'comments'  ''
                                           'genre'  'Electronic'
                                             'bpm'  '119.7'
                                             'key'  '1A'
                                        'acoustid'  ''
rest: ''

======================== rawer (from filesystem) ========================

'COMM::\x00\x00\x00'                                "CD'n'Go! Suite 2.00.945"
'POPM:'                                             POPM(email='', rating=204)
'TALB' (Album/Movie/Show title)                     'Liquid'
'TBPM' (BPM (beats per minute))                     '119.7'
'TCON' (Content type, a.k.a. Genre)                 'Electronic'
'TIT2' (Title/songname/content description)         'Want'
'TKEY' (Initial key)                                '1A'
'TPE1' (Lead performer(s)/Soloist(s))               'Recoil'
'TRCK' (Track number/Position in set)               '2/11'
'TXXX:q-bass'                                       '4'
'TXXX:q-drums'                                      '3'
'TXXX:q-other'                                      '2'
'TXXX:q-piano'                                      '1'
'TXXX:q-vocals'                                     '2'

========================== row from database ==========================
                                              'id'  1538531
                                            'path'  /data/Music/Other/PrevSet/[0yay1]/Recoil/Want.mp3
                                         'working'  None
                                         'bitrate'  239
                                    'duration_sec'  369
                                           'genre'  Electronic
                                        'filesize'  11029734
                                           'mtime'  1662800270
                                   'redo_metaread'  0
                                        'rest_str'   PrevSet [0yay1] Electronic
                                      'tag_artist'  Recoil
                                     'tag_release'  Liquid
                                       'tag_title'  Want
                                             'bpm'  119.7
                                    'search_title'  'want':1
                                   'search_artist'  'recoil':1
                                  'search_release'  'liquid':1
                                     'search_rest'  '0yay1':2,3 'electronic':4 'prev':5 'prevset':1 'set':6
                                    'search_combo'  '0yay1':5,6 'electronic':7 'liquid':3C 'prev':8 'prevset':4 'recoil':2B 'set':9 'want':1A
                                    'tag_tracknum'  2
                                      'num_images'  0
                                             'key'  1A
                                           'quals'  ['q-bass-4', 'q-drums-3', 'q-other-2', 'q-piano-1', 'q-vocals-2']
                                      'lastfmtags'  []
                                        'tag_date'  
                                     'discogstags'  []

============================== file details ==============================
                                           'mtime'  1662800269.9059002  (2022-09-10 10:57:49)
                             'size'  11029734